Why does the MyVolt replacement power adapter
hum massive and the original is dead quiet?
Same set up for both.
D
When I grounded the amp the hum was gone! But why wasn’t there any hum when I used the original power supply and the amp ungrounded.
What has the original power supply got that the MyVolts dosen´t have?
D
What do you mean by “grounded the amp”? Are you playing your QC through a guitar amplifier? And it wasn’t previously grounded? Are you sure that the QC is actually in any way related to this hum? Maybe it was just the ungrounded amp and would have hummed no matter what you plugged into it?
Confused why the amp would be ungrounded…..
Yes I use my effects through an amp. Send return.
When I use the power supply that comes with QC. There is no problem with hum.
When I use MyVolts power supply I got a hum.
This is related to an amp that has no ground connection at the power supply.
What differs the two power supply, just curious!
D
I don’t really know why the original power supply is behaving differently, but I’ll ask this anyway.
Are you using any other pedals with the QC? Are they isolated properly so that their noise doesn’t travel to the QC and get further amplified? Are you using a gate? If you aren’t using a noise gate in the QC, try enabling one near the front of your signal chain (even the one in the input block). If the noise goes away (or doesn’t) it may help figure this out.
Note - I use the MyVolts yellow plug (-12V) with a power bank, and it introduces no noise at all. One thing I’ve learned about power banks is that even though they often have more than one port, you can’t reliably use more than one port. First of all, you might be asking for different voltages, and most batteries can’t delivery -12v on one port and -9v on another. And even if both were providing the same voltage, they are not usually fully isolated from each other.